mssearch floods the log file

Recently the following message floods our log file and eats a lot of disk space.  Anybody knows what is the root cause.

01/08/2009 18:50:00.65     mssearch.exe (0x0F20)                       0x1594    Search Server Common              GathererSql                       0    Medium      CGatherAddLink::InsertLink: InsertRow on TempTable succeeded, URL http://www.xxx.com, CrawlID 159296, SourceDocID 195 - File:d:\office\source\search\search\gather\server\gatherobj.cxx Line:468     
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